[Qgis-user] GPS issue on android tablet

[Richard McDonnell]

Hi,
Most mobile devices now utilise this Assisted GPS or (A-GPS), its main 
use is to speed up initialisation times on mobile devices.
I am afraid though that in relation to accuracies, you are still looking 
at approximately 3-5m at best.
  As discussed previously, the only way to get sub meter accuracies (at 
present) is to utilise NRTK which is usually a subscription based 
service, requiring 3rd Party software.
Regards,

Richard McDonnell


On 12/06/2014 10:28, Giuseppe De Marco wrote:
> Hello again,
> concerning the limitation imposed by GPS hardware, I
> have to point out that on my smartphone (GT-I9505) there
> is an option among localization services which can be checked
> as high precision in GPS postion seeking that uses wifi and 3G
> in addition to GPS.
> As a matter of fact that option goes beyond GPS hardware limitation
> and makes me able to retrieve positioning with a very low precision error.
> I have to make tests now installing qgis on my phone and I will
> post results as soon as possibile.
>
> Giuseppe De Marco
>
> 2014-06-04 20:34 GMT+02:00 Giuseppe De Marco<demarco.giuseppe at gmail.com>:
>> Thank for your quick reply .
>> I went searching on the internet
>> and I've found an interesting project named Piksi.
>> Guess we'll have to wait and see!
>>
>> 2014-06-04 16:17 GMT+02:00 Richard McDonnell<richard.mcdonnell at opw.ie>:
>>> This is down to the accuracy of the Receiver, nothing to do with QGIS.
>>> You wont get Survey Grade data collection from any Tablet on the market
>>> at present. Even with a Survey Grade GNSS Receiver connected to your
>>> tablet, a 3.0 meter accuracy would be best case scenario.  Your only
>>> solution is a dedicated GNSS Enable hand-held data collection unit,
>>> utilising a real-time correction service, a number of Providers provide
>>> such solutions, but they are expensive.
>>> Regards,
>>>
>>> Richard.
>>>
>>>
>>> On 04/06/2014 10:07, Giuseppe De Marco wrote:
>>>> hello, I've been using Qgis on android tablet (samsung galaxy tab 2)
>>>> and I've been experimenting GPS connection.
>>>> The issue is that even if Qgis finds and use several satellites (9 or more)
>>>> precision never gets under 3.0 meters but what is strange is that
>>>> coordinates value fro the same spot varies very widely:
>>>> Time                Coordinates                       Altitude
>>>> 14:39:36       41.69528959 13.26464738      343.1
>>>> 14:39:54       41.69529880 13.26466761      341.8
>>>> 14:40:06       41.69528519 13.26470222      340.4
>>>> 14:41:18       41.69528944 13.26472418      341.1
>>>> 14:41:42       41.69529608 13.26471821      341.8
>>>> 14:41:54       41.69530621 13.26470892      342.5
>>>>
>>>> I have colleagues who have experienced the same.
>>>> Has anyone else experienced the same issue?
>>>> Is that depending on GPS device or could it be a software related
>>>> issue?
>>>>
>>>
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>>>
>>
>>
>> --
>> Dott. Agr. Giuseppe De Marco
>> RSPP settore ATECO 1
>> Cell./Mobile: +39 3935041115
>> Fax.: +39 07751850973
>> PEC: giuseppe.de_marco at epap.conafpec.it
>
>
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